Retrovesical hernia
[医] 膀胱后疝
🧩 词语组成解析
n. 疝气\\n[医] 疝, 突出
🗣️ 情景例句
Today is the twelfth. Why?
今天是十二号。怎么？
Why didn't you do it?
为什么你不做？
This is because they had no natural enemies until the arrival of humans and therefore did not need to develop flying wings.
这是因为人类到达这里之前，这些鸟没有天敌，因此，它们不需要发育飞行的翅膀。